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i HATE the sound dump valves make but this is just my opinion, id much rather stick with the standard re-circ valve, or on the small turbo the standard dump valve which is actually very good, its placed nicely on the comp housing, but me personally i dont like dump valves.
Funny you should say that. According to the service history, mine used to have one fitted, then I came across the receipt for the new hybrid turbo at £1200, which clearly stated 'replace turbo with TT hybrid due to dump valve failure.'
Now that statements enough for me never to have a dump valve again. Besides, I think there a bit out of date now, and maybe even seen as 'uncool'. Just my opinion of course.